Acquisition model calculation method and device of strip acquisition imaging radar and storage medium

Abstract

The invention discloses an acquisition model calculation method of a strip acquisition imaging radar. The acquisition model calculation method comprises the following steps: step 1, inputting equipment parameters and acquisition parameters; step 2, calculating a strip coverage area; step 3, calculating a mopping angle; step 4, calculating a beam coverage area; step 5, calculating the ground projection distance from the wave beam center point to the acquisition platform; 6, calculating an included angle between the target point and the collection starting point; 7, calculating an included angle between the target point and the acquisition termination point; 8, calculating the distance between the target point and the collection point; step 9, calculating the longitude, latitude and the like of an acquisition starting point; and step 10, calculating constraint conditions, and judging whether the strip coverage area is within the beam coverage area. According to the method disclosed by the invention, key steps in model calculation are specifically designed, and automatic generation of the model can be completed.

Description

Technical Field

[0001] The present invention belongs to the field of radar parameter design and data acquisition, and in particular relates to an acquisition model calculation method, a device and a storage medium of a strip acquisition imaging radar in the field. Background Art

[0002] Airborne Synthetic Aperture Radar (SAR) is widely used, ranging from military reconnaissance to civilian mapping. However, there is no mature method for designing the acquisition model of airborne SAR. Most of them are based on experience or actual flight tests to plan the acquisition plan and obtain the acquisition parameters. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method, device and storage medium for calculating the acquisition model of a strip acquisition imaging radar, which can complete the acquisition parameter calculation according to the design parameters of different radars, and at the same time can adjust the ground-grabbing angle according to the actual situation of the strip coverage area, and obtain the longitude and latitude coordinates of the starting point of the acquisition route, and finally realize the standardized design of the acquisition model.

[0004] The present invention adopts the following technical solution:

[0005] A strip acquisition imaging radar acquisition model calculation method, the improvement of which is that it includes the following steps:

[0006] Step 1: Enter device parameters and acquisition parameters:

[0007] Equipment parameters include beam width, sampling gate, sampling frequency, and pulse width, and acquisition parameters include flight altitude and center point ratio;

[0008] Step 2, calculate the strip coverage area:

[0009] First, calculate the angle α1 between the acquisition starting point and the horizon:

[0010]

[0011] In the above formula, h is the flight altitude, st is the sampling gate, and c is the speed of light;

[0012] Then calculate the angle α2 between the acquisition end point and the horizon:

[0013]

[0014] In the above formula, pw is the pulse width;

[0015] The length of the area covered by the strip is:

[0016] h×(tanα2)-h×(tanα1)

[0017] Step 3, calculate the rubbing angle α3:

[0018] First calculate the length of line segment l1:

[0019]

[0020] Then calculate the length of line segment l2:

[0021]

[0022] Finally, calculate the rubbing angle α3:

[0023]

[0024] Step 4, calculate the beam coverage area:

[0025] First, calculate the near-end angle α4 of the beam:

[0026]

[0027] In the above formula, θ is the beam width;

[0028] Then calculate the beam distal angle α5:

[0029] α5=α4-θ

[0030] Step 5, calculate the ground projection distance l3 from the beam center to the acquisition platform:

[0031]

[0032] Step 6, calculate the angle α6 between the target point and the acquisition starting point:

[0033]

[0034] In the above formula, l4 is half of the route length, α 0ff is the deviation angle between the route and the true north direction; Step 7, calculate the angle α7 between the target point and the acquisition end point:

[0035]

[0036] Step 8, calculate the distance l5 between the target point and the collection point:

[0037]

[0038] Step 9: Calculate the longitude Lat of the collection starting point start , the latitude of the collection starting point Lon start , collect the longitude of the end point Lat end, the latitude of the acquisition termination point Lon end :

[0039]

[0040] In the above formula, R is the radius of the earth, Lαt target is the longitude of the target to be measured, Lon target is the latitude of the target to be measured;

[0041] Step 10, constraint condition calculation, determine whether the strip coverage area is within the beam coverage range:

[0042] Compare the lengths of l1, l2 with the near and far ends of the beam. If l1 > h × tanα4 and l2 < h × tanα5, then the model holds.

[0043] An acquisition model calculation device for a strip acquisition imaging radar, which is improved in that it includes: a processor; a memory, in which executable instructions of the processor are stored; wherein, the processor is configured to execute the steps of the above method by executing the executable instructions.

[0044] A computer-readable storage medium for storing a program, which is improved in that the steps of the above method are implemented when the program is executed.

[0045] The beneficial effects of the present invention are:

[0046] The method disclosed by the present invention specifically designs the key steps in model calculation, can complete the automatic generation of the model; can divide the strip coverage area according to the actual acquisition situation, and can meet the design needs of different scenarios; can automatically judge the effectiveness of the model and improve the planning efficiency; can provide accurate acquisition coordinate points for actual acquisition operations, and solve the problem of inaccurate acquisition coordinate calculation in the actual operation process. Description of the Drawings

[0047] Figure 1 is a flow schematic diagram of the method of the present invention;

[0048] Figure 2 is a schematic diagram of the acquisition model;

[0049] Figure 3 is the strip coverage area of the acquisition model at a height of 300m;

[0050] Figure 4 is the grazing angle of the acquisition model at a height of 300m;

[0051] Figure 5 is the beam coverage area of the acquisition model at a height of 300m;

[0052] Figure 6is the angle and distance of the acquisition points of the 300m height acquisition model;

[0053] Figure 7 It is the calculated coordinates and model output of the acquisition model at 300m height;

[0054] Figure 8 It is the strip coverage area of ​​the acquisition model at 500m altitude;

[0055] Fig. 9 It is the ground-grazing angle of the acquisition model at 500m altitude;

[0056] Fig.10 This is the beam coverage area of ​​the acquisition model at 500m altitude;

[0057] Fig.11 is the angle and distance of the acquisition points of the 500m height acquisition model;

[0058] Fig.12 These are the calculated coordinates and model output of the 500m altitude acquisition model. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0060] Embodiment 1, this embodiment discloses a method for calculating an acquisition model of a strip acquisition imaging radar, such as Figure 1 As shown, the following steps are included:

[0061] Step 1: Enter device parameters and acquisition parameters:

[0062] Equipment parameters include beam width, sampling gate, sampling frequency, and pulse width, and acquisition parameters include flight altitude and center point ratio;

[0063] Step 2, calculate the strip coverage area:

[0064] The length of the hypotenuse at the start and end of the acquisition is calculated based on the input sampling gate and pulse width, and the length of the strip coverage area (i.e., the strip width) is calculated in combination with the flight height parameter;

[0065] like Figure 2 As shown, first calculate the angle α1 between the acquisition starting point and the horizon:

[0066]

[0067] In the above formula, h is the flight altitude, st is the sampling gate, and c is the speed of light;

[0068] Then calculate the angle α2 between the acquisition end point and the horizon:

[0069]

[0070] In the above formula, pw is the pulse width;

[0071] The length of the area covered by the strip is:

[0072] h×(tanα2)-h×(tanα1)

[0073] Step 3, calculate the rubbing angle α3:

[0074] Mainly complete the calculation of the projection position of the beam center point on the ground, which needs to be obtained by combining the calculation result of step 2 with the input ratio and flight altitude;

[0075] like Figure 2 As shown, first calculate the length of line segment l1:

[0076]

[0077] Then calculate the length of line segment l2:

[0078]

[0079] Finally, calculate the rubbing angle α3:

[0080]

[0081] Step 4, calculate the beam coverage area:

[0082] The beam coverage area mainly calculates the projection points of the near and far ends of the beam;

[0083] like Figure 2 As shown, first calculate the near-end angle α4 of the beam:

[0084]

[0085] In the above formula, θ is the beam width;

[0086] Then calculate the beam distal angle α5:

[0087] α5=α4-θ

[0088] Step 5, such as Figure 2 As shown, calculate the ground projection distance l3 from the beam center to the acquisition platform:

[0089]

[0090] Step 6, such as Figure 2 As shown, calculate the angle α6 between the target point and the acquisition starting point:

[0091]

[0092] In the above formula, l4 is half of the flight path length, and α 0ff is the deviation angle between the flight path and the due north direction;

[0093] Step 7, calculate the included angle α7 between the target point and the acquisition termination point:

[0094]

[0095] Step 8, calculate the distance l5 between the target point and the acquisition point:

[0096]

[0097] Step 9, calculate the longitude Lat start , latitude Lon start of the acquisition starting point, longitude Lat end , latitude Lon end of the acquisition termination point:

[0098]

[0099] In the above formula, R is the radius of the earth, and Lαt target is the longitude of the measured target, and Lon target is the latitude of the measured target;

[0100] Step 10, constraint condition calculation, determine whether the strip coverage area is within the beam coverage range:

[0101] Compare the length relationships of l1, l2 with the near and far ends of the beam. If l1 > h × tanα4 and l2 < h × tanα5, then the model holds.

[0102] The plane distance conversion calculation mainly realizes the calculation of the plane distance and relative angle between the starting and ending coordinate points of the flight path and the target point; the calculation of the starting and ending coordinate points of the flight path can provide accurate acquisition coordinate points for actual acquisition operations.

[0103] Output of the acquisition model:

[0104] α3, Lat start , Lon start , Lat end , Lon end are the main parameters output by the acquisition model.

[0105] Figure 3 is the strip coverage area of the acquisition model at a height of 300m; Figure 4 is the grazing angle of the acquisition model at a height of 300m; Figure 5This is the beam coverage area of ​​the acquisition model at 300m altitude; Figure 6 is the angle and distance of the acquisition points of the 300m height acquisition model; Figure 7 These are the calculated coordinates and model output of the 300m height acquisition model.

[0106] Figure 8 It is the strip coverage area of ​​the acquisition model at 500m altitude; Fig. 9 It is the ground-grazing angle of the acquisition model at 500m altitude; Fig.10 This is the beam coverage area of ​​the acquisition model at 500m altitude; Fig.11 is the angle and distance of the acquisition points of the 500m height acquisition model; Fig.12 These are the calculated coordinates and model output of the 500m altitude acquisition model.

[0107] This embodiment also discloses an acquisition model calculation device for a strip acquisition imaging radar, comprising: a processor; a memory, in which executable instructions of the processor are stored; wherein the processor is configured to execute the steps of the above method by executing the executable instructions.

[0108] This embodiment also discloses a computer-readable storage medium for storing a program, which implements the steps of the above method when executed.

Claims

1. A method for calculating an acquisition model of a strip acquisition imaging radar, characterized in that: It includes the following steps: Step 1, input device parameters and acquisition parameters: The device parameters include beam width, sampling gate, sampling frequency, and pulse width, and the acquisition parameters include flight altitude and center point ratio; Step 2, calculate the strip coverage area: First, calculate the angle α1 between the acquisition starting point and the horizon: In the above formula, h is the flight altitude, st is the sampling gate, and c is the speed of light; Then, calculate the angle α2 between the acquisition ending point and the horizon: In the above formula, pw is the pulse width; The length of the strip coverage area is: h×(tanα2)-h×(tanα1) Step 3, calculate the grazing angle α3: First, calculate the length of line segment l1: Then, calculate the length of line segment l2: Finally, calculate the grazing angle α3: Step 4, calculate the beam coverage area: First, calculate the proximal beam angle α4: In the above formula, θ is the beam width; Then, calculate the distal beam angle α5: α5=α4 - θ Step 5, calculate the distance l3 from the beam center point to the ground projection of the acquisition platform: Step 6, calculate the angle α6 between the target point and the acquisition starting point: In the above formula, l4 is half of the route length, α 0ff is the deviation angle between the route and the true north direction; Step 7, calculate the angle α7 between the target point and the acquisition ending point: Step 8, calculate the distance l5 between the target point and the acquisition point: Step 9: Calculate the longitude Lat of the collection starting point start , the latitude of the collection starting point Lon start , collect the longitude of the end point Lat end , the latitude of the acquisition end point Lon end : In the above formula, R is the radius of the earth, Lαt target is the longitude and Lon of the target being measured target is the latitude of the target being measured; Step 10, constraint condition calculation, determine whether the strip coverage area is within the beam coverage range: Compare the length relationships of l1, l2 with the proximal and distal ends of the beam. If l1>h×tanα4 and l2<h×tanα5, then the model holds.

2. A collection model calculation device for a strip collection imaging radar, characterized in that: It includes: A processor; a memory storing executable instructions of the processor; wherein, the processor is configured to execute the steps of the method according to claim 1 by executing the executable instructions.

3. A computer-readable storage medium for storing a program, characterized in that: When the program is executed, it implements the steps of the method according to claim 1.

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